1 #!/bin/sh -e

     2 # Based on: http://www.cuddletech.com/blog/pivot/entry.php?id=989

     3 #

     4 # This script differs from original Zynk that uses -R and destination dataset,

     5 # not filesystem.

     6 #

     7 ## ZYNK: The Zuper Zimple ZFS Sync (Replication) Tool

     8 ## Form: zynk local/dataset root@remote.host destination/dataset

     9 

    10 # Please note: The reason this is so simple is because there is no error

    11 # checking, reporting, or cleanup.

    12 #

    13 # In the event that something goes wonkey, you'll manually need to fix the

    14 # snapshots and modify or remove the run datafile which contains the most

    15 # recent snapshot name.

    16 #

    17 # Furthermore, this absolutely relies on the GNU version of 'date' in order to

    18 # get epoch time.

    19 #

    20 # Before using, make sure you've:

    21 #   1. distributed your SSH key to the remote host and can ssh without

    22 #      password;

    23 #   2. delegated zfs rights to the user performing zynk.

    24 #

    25 

    26 if [ -z "$3" ]; then

    27         echo "Usage: zynk local/dataset remote.host destination/dataset"

    28         exit 1

    29 fi

    30 

    31 DATE=`date +%s`

    32 if [ "$DATE" = "%s" ]; then

    33         echo "Must use GNU Date, please install and modify script."

    34         exit 2

    35 fi

    36 

    37 LOCALFS=$1

    38 HOST=$2

    39 REMOTEFS=$3

    40 RUNF=`echo $LOCALFS-$HOST-$REMOTEFS|sed -e 's{[@/]{-{g'`

    41 CUR=`date '+%F-%H%M'`

    42 

    43 TYPE="Full"

    44 SEND_OPTS=""

    45 

    46 if [ -e $RUNF ]; then

    47 	TYPE="Incremental"

    48 	SEND_OPTS="-i $LOCALFS@`cat $RUNF`"

    49 fi

    50 

    51 echo "$TYPE started at `date`"

    52 zfs snapshot -r $LOCALFS@$CUR

    53 zfs send -v -R $SEND_OPTS $LOCALFS@$CUR | ssh $HOST zfs recv -F -d $REMOTEFS

    54 echo $CUR > $RUNF

    55 echo "$TYPE complete at `date`"